Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Name:	us-gaap_GoodwillImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Goodwill - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
Goodwill - Narrative (Details) $ in Millions	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) reporting_unit	Sep. 30, 2019 USD ($)
Accounting Policies [Abstract]
Number of reporting units \| reporting_unit			3
Goodwill [Line Items]
Impairment charges	$ 33.5	$ 0.0	$ 33.5	$ 0.0
Ancillary Services
Goodwill [Line Items]
Impairment charges			28.6
Alliance
Goodwill [Line Items]
Impairment charges			$ 4.9